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Unit testing is a method by which individual units of source code, sets of one or more computer program modules together with associated control data, usage procedures, and operating procedures, are tested to determine if they are fit for use. Intuitively, one can view a unit as the smallest testable part of an application. Let me take the example of the ‘Calculator’ for demonstrating the unit testing.

SOFTWARE REQUIREMENTS:

Windows 7 as OS

Microsoft Visual Studio 2010 as IDE

NUnit as Unit Testing Tool

SET-UP INSTRUCTIONS:

Create a new Project with C# Class Library and save it (‘Calculator’ in my example).

Rename the class ‘Class1.cs‘ to ‘Operator.cs‘.

Add the NUnit frameworks into the ‘Solution Explorer‘ by context-clicking on the project name and then select ‘Add Reference’ menu item.

When the Add Reference dialog appears, click on ‘Browse‘ and navigate to C:\Program Files (x86)\NUnit…